Results 131 to 140 of about 5,015,013 (196)
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Optical activity and evolution
Journal of Theoretical Biology, 1980It is noted that the chemical reactions occurring in rarefied cosmic clouds (molecular concentration less than or approximately to 10(2) cm-3) differ from similar laboratory reactions by the much greater effect on the outcome of external force fields.
G P, Gladyshev, M M, Khasanov
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The optical activity of polypeptides
Biopolymers, 1983AbstractThe present status of the theory of the optical properties of polypeptides is discussed in a general way. Arguments are presented that indicate that the interaction of exciton bands in helices will occur in a tensorial way with the parallel polarized bands normally having stronger interactions than the perpendicular polarized bands, with only ...
J A, Schellman, W J, Becktel
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Development of space active optics for a whiffletree supported mirror.
Applied Optics, 2019The requirements of a lightweight primary mirror for large-aperture space telescopes include a precise mirror figure and high reliability. However, lightweight mirrors are easily affected by environmental disturbances, as they lack structural stability ...
Pingwei Zhou +3 more
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Conference on Spatial Atmospheric Marine Environmental Optics
This paper proposes the implementation of a self-deformation estimation strategy for an active mirror within a framework of mechanoelectrical sensing. This architecture can collaborate with conventional optical wavefront sensors in a complementary manner,
Chuyue Yu, Kainan Wang
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This paper proposes the implementation of a self-deformation estimation strategy for an active mirror within a framework of mechanoelectrical sensing. This architecture can collaborate with conventional optical wavefront sensors in a complementary manner,
Chuyue Yu, Kainan Wang
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Experiments on the Origins of Optical Activity
Origins of Life, 1974Two recent reports claim that (1) aqueous L-aspartic acid polymerizes faster than D-Asp in the presence of kaolin at 90 degrees, and (2) L-phenylalanine is adsorbed by kaolin more extensively than D-Phe at pH 4(the reverse being true at pH2). The novelty of these observations and their potential significance for the origin of optical activity has ...
W A, Bonner, J J, Flores
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Development of a prototype active optics system for future space telescopes.
Applied Optics, 2018It is envisaged that future large space telescopes will be lightweight and employ active optics to maintain optical quality throughout the mission lifetime.
N. Devaney +4 more
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Control algorithm and performance of the active optics system of the Giant Magellan Telescope
Astronomical Telescopes + Instrumentation, 2018The GMT active optics (AcO) control problem is unique because the primary and secondary mirrors are both segmented. This paper describes the AcO control algorithms and assesses their performance for the Natural Seeing observing modes of the GMT.
R. Conan +6 more
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An active optics system for large UVOIR space telescopes
Astronomical Telescopes + Instrumentation, 2018The next generation of large monolithic mirror space telescopes will use aberration correction to ensure resolution performance is maintained throughout their mission.
F. Kenny +4 more
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Coupled Ferroelectricity and Optical Activity in Optically Active Ferroelectrics
The Journal of Physical Chemistry LettersFerroelectricity was initially discovered in 1921 in Rochelle salt (potassium sodium tartrate tetrahydrate), a chiral compound containing a chiral unit. However, the inherent relationship between coupled ferroelectricity and optical activity in chiral ferroelectrics derived from achiral units, as well as in polar ferroelectrics, remains insufficiently ...
Xiang-Bin Han, Wen Zhang
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Nature, 1972
Simple pictorial arguments can demonstrate that the natural and Faraday rotation experiments conserve parity and time-reversal invariance. The method can be used to predict possible new effects without recourse to mathematical theories.
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Simple pictorial arguments can demonstrate that the natural and Faraday rotation experiments conserve parity and time-reversal invariance. The method can be used to predict possible new effects without recourse to mathematical theories.
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